title: Trail of trial lenses.
authors.forename: Richard
authors.initials: R
authors.lastname: Keeler
authors.forename: Arun D
authors.initials: AD
authors.lastname: Singh
authors.forename: Harminder S
authors.initials: HS
authors.lastname: Dua
mesh_terms: D004739:England; D005139:Eyeglasses / Q000266:history*; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D006801:Humans; D007909:Lenses / Q000266:history*; D008297:Male; D009907:Optometry / Q000266:history*